[1eyedjack]

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MP, Instant, 35

If ever you needed evidence that there is no link between the explanation for bids and what GIB actually interprets, this is it.

[Stephen Tu]

I think its interpretation of what the bid shows is likely fine, it just probably lacks rules for these super-rare SOS redouble situations, so has no idea what its bids means following it, and gives up defaulting to pass. Remember computers don't have common sense, so when you get "out of book", as this auction must be exceedingly rare (I certainly haven't ever cue bid in this situation as South, I think normal with this type of hand is pass the transfer, then takeout double if it gets passed back to me), it's likely to fall apart. Certainly they could add rules for this auction and get North to bid, but probably it ought to be super low priority compared to fixing more common auctions where it is screwing up like responding to normal takeout doubles.

[1eyedjack]

I had the impression that GIB has two approaches to bidding:
(1) rule based
(2) simulation based

It starts with rules. When it runs out of rules, it resorts to simulations.
The point at which it runs out of rules varies depending on how the auction progresses.

That is all complete speculation on my part. I'd be delighted to be enlightened if that is all wrong.

So, GIB opens 1N and its partner bids 2C. It has 4 card Heart suit and is in rule-based mode: It bids 2H and has no thought for how successful that bid will be. Its partner bid 3H and GIB resorts to sim-mode to determine whether to pass or bid 4H.

What seems to happen here and on other odd occasions is that it is stuck in rule-based mode but lacks the rules. At that point it should switch to sim-based mode but instead defaults to "pass" under rule-based mode.

The odd thing on this hand is that someone has gone to some lengths to define the meanings of the 2H cue and the subsequent redouble. Rare, the sequence may be, but if you are going to go to that much trouble as to cater for it, you should either go the extra mile and define the continuations or release GIB from its rule-based constraints at that point and allow it to simulate. ANY simulations run by GIB North would tell it that bidding Diamonds would be more profitable than passing.

[Stefan_O]

1eyedjack, on 2016-April-24, 11:07, said:

someone has gone to some lengths to define the meanings of the 2H cue and the subsequent redouble

I'm not sure the redouble has actually been defined... doesn't it just show the same hand-description as the preceeding 2H bid?
(unfortunately the end of the descriptions run outside the image-frame in my browser, so I can't tell exactly...)

Still, I agree -- of course, the 2H bid description should be enough to conclude there is some better contract than 2HXX
Somebody should look into this.